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USB port of HP laptop not working
suddenly all of my usb ports of HP pavilion g6 laptop stopped working. i was using 1 usb mouse and 1 external hard disk. but both of them are not working now. in device manager, it shows unknown device with a yellow triangular mark. i tried some ways like shut down laptop, unplug ac connection, remove battery for half an hour and then again put all back.....but it not worked. i tried update driver but it shows latest driver is installed. Plz help